GEC BRT400K chassis topside view showing a new mains transformer cover. This set started as a BRT402K, and was later given the correct table cabinet to convert it into a BRT400K. Note Kapton tape over the IFT holes, to keep dirt out. Beehive trimmers make this a very sensible precaution. Notice the adaptor plates used to fit B7G valves into chassis holes originally used for B8G types.